JP2020092725A - Bed for neutron capture therapy - Google Patents

Abstract

To provide a bed for a neutron capture therapy on which a patient can easily maintain a posture.SOLUTION: A bed for a neutron capture therapy 3 comprises frames 43A, 43B and a presser part 47 attached to the frames 43A, 43B, in addition to a placement part 42 on which a patient S is placed. The presser part 47 attached to the frames 43A, 43B can press at least one of an occiput, a jaw, a back and a waist of the patient S. Therefore, the presser part 47 can press at least one of the occiput, the jaw, the back and the waist depending on a posture of the patient S who is placed on the placement part 42. As a result, the patient S can more easily maintain his/her posture because the patient S is not only placed on the placement part 42 but also has his/her body part pressed, which may reduce a burden in connection with posture maintenance.SELECTED DRAWING: Figure 4

Description

The present invention relates to a neutron capture therapy bed.

As a treatment method using radiation, boron neutron capture therapy (BNCT), which is a neutron capture therapy for irradiating neutron rays to kill cancer cells, is known. In the boron neutron capture therapy, the neutron beam is irradiated to the boron that has been taken up in the cancer cell in advance, and the cancer cell is selectively destroyed by the scattering of the heavy charged particles caused by the irradiation. In such neutron capture therapy, it is common to irradiate a patient placed on a bed for neutron capture therapy with neutron rays. As a bed for neutron capture therapy used in such neutron capture therapy, the one described in Patent Document 1 is known.

JP, 2016-083288, A

In neutron capture therapy, the irradiation time of radiation (neutron beam in the case of neutron capture therapy) to a patient is longer than that in other radiotherapy. Specifically, the irradiation time of radiation is about several minutes in other radiation treatments, whereas the irradiation time of neutron rays is about 1 hour in neutron capture therapy. Therefore, depending on the posture of the patient placed on the bed for neutron capture therapy, it is necessary for the patient to maintain an unreasonable posture for a long time. Therefore, there has been a demand for a neutron capture therapy bed in which the patient can easily maintain his/her posture.

Therefore, an object of the present invention is to provide a bed for neutron capture therapy in which the patient can easily maintain his/her posture.

In order to solve the above problems, the neutron capture therapy bed according to the present invention is a neutron capture therapy bed for mounting a patient irradiated with neutrons, and is provided on a base, on which the patient is mounted. The placement unit, a frame provided on the base, and a holding unit attached to the frame for holding at least one of the occipital region of the patient, the chin, the back, and the waist.

The bed for neutron capture therapy according to the present invention includes a mounting part on which a patient is mounted, a frame, and a holding part attached to the frame. The holding part attached to the frame can hold at least one of the back of the patient's head, the jaw, the back, and the waist. Therefore, the holding portion can hold at least one of the occipital region, the chin, the back, and the waist according to the posture of the patient placed on the placing portion. As described above, the patient can easily maintain the posture by not only placing the patient on the placing portion but also pressing a portion of the body part that can reduce the burden of maintaining the posture.

The neutron capture therapy bed may further include an arm that movably supports the pressing portion. Thus, the position of the pressing portion can be finely adjusted by the arm according to the posture of the patient.

In the neutron capture therapy bed, a pair of frames may be provided, a vertical wall may be provided between the pair of frames, and a through hole may be formed in the vertical wall. By arranging the vertical wall provided between the frames along the wall of the irradiation chamber, the patient can be brought close to the vicinity of the neutron beam emission port. At this time, by aligning the positions of the through hole formed on the vertical wall and the emission port, the vicinity of the affected part of the patient can be brought close to the emission port through the through hole.

According to the present invention, it is possible to provide a bed for neutron capture therapy in which the patient can easily maintain the posture.

It is a figure which shows the structure of the neutron capture therapy system provided with the bed for neutron capture therapy of this embodiment. It is a figure which shows the neutron beam irradiation part vicinity in the neutron capture therapy system of FIG. It is the figure which looked at the bed for neutron capture therapy from the negative side of the direction of the Y-axis. FIG. 4 is a sectional view taken along line IV-IV shown in FIG. 3. It is the figure which looked at the bed for neutron capture therapy from the positive side of the Y-axis direction. It is the figure which looked at the presser part of the back of the head from the positive side in the direction of the Z-axis. It is the figure which looked at the presser part of the back of the head from the positive side in the direction of the Z-axis. It is a figure which shows the bed for neutron capture therapy when a patient's posture differs from FIG. It is a figure which shows the bed for neutron capture therapy when a patient's posture differs from FIG.

Hereinafter, the bed for neutron capture therapy according to the present invention will be described with reference to the accompanying drawings. In each figure, the same or corresponding parts will be denoted by the same reference symbols, without redundant description.

First, an outline of a neutron capture therapy system including a neutron capture therapy bed according to the present embodiment will be described with reference to FIGS. 1 and 2. As shown in FIG. 1 and FIG. 2, a neutron capture therapy system 1 for treating cancer using boron neutron capture therapy is a boron of a patient S (irradiated body) to which a drug containing boron ( ¹⁰ B) is administered. It is a system that treats cancer by irradiating neutron rays to the accumulated area. The neutron capture therapy system 1 has an irradiation room 2 for irradiating a patient S, who is restrained by a bed 3 for neutron capture therapy, with a neutron beam N to treat cancer in the patient S.

Preparatory work such as restraining the patient S on the neutron capture therapy bed 3 is performed in a preparation room (not shown) outside the irradiation room 2, and the neutron capture therapy bed 3 with the patient S restrained is irradiated from the preparation room. Moved to Chamber 2. Then, the bed 3 for neutron capture therapy is installed at a predetermined position in front of the emission port of the irradiation chamber 2. The details of the configuration of the bed 3 for neutron capture therapy will be described later. In addition, the neutron capture therapy system 1 includes a neutron capture therapy bed 3 on which a patient S is placed, a neutron beam generator 10 for generating a therapeutic neutron beam N, and a neutron capture therapy bed in the irradiation chamber 2. The neutron beam irradiation part 20 which irradiates the patient S mounted in 3 with the neutron beam N is provided. Although the irradiation chamber 2 is covered by the shielding wall W, a passage and a door 45 are provided so that patients, workers, etc. can pass through.

The neutron beam generator 10 scans the charged particle beam L, and an accelerator 11 that accelerates the charged particle to emit the charged particle beam L, a beam transport path 12 that transports the charged particle beam L emitted by the accelerator 11. A charged particle beam scanning unit 13 that controls the irradiation position of the charged particle beam L with respect to the target 8, a target 8 that causes a nuclear reaction to generate a neutron beam N by being irradiated with the charged particle beam L, and a charged particle beam A current monitor 16 for measuring the L current. The accelerator 11 and the beam transport path 12 are arranged inside a charged particle beam generating chamber 14 having a substantially rectangular shape, and the charged particle beam generating chamber 14 is a space covered with a concrete shielding wall W. .. The charged particle beam generating chamber 14 is provided with a passage and a door 49 through which a worker for maintenance passes. The charged particle beam generation chamber 14 is not limited to the substantially rectangular shape, and may have another shape. For example, when the path from the accelerator to the target is L-shaped, the charged particle beam generation chamber 14 may also be L-shaped. Further, the charged particle beam scanning unit 13 controls the irradiation position of the charged particle beam L with respect to the target 8, and the current monitor 16 measures the current of the charged particle beam L with which the target 8 is irradiated.

The accelerator 11 accelerates charged particles such as protons to generate a charged particle beam L such as a proton beam. In this embodiment, a cyclotron is adopted as the accelerator 11. Instead of the cyclotron, another accelerator such as another circular accelerator (for example, synchrotron), a linear accelerator, or an electrostatic accelerator may be used as the accelerator 11.

One end (upstream end) of the beam transport path 12 is connected to the accelerator 11. The beam transport path 12 includes a beam adjusting unit 15 that adjusts the charged particle beam L. The beam adjusting unit 15 includes a horizontal steering electromagnet and a horizontal vertical steering electromagnet that adjust the axis of the charged particle beam L, a quadrupole electromagnet that suppresses the divergence of the charged particle beam L, and a four-way shaper that shapes the charged particle beam L. It has slits. The beam transport path 12 may have a function of transporting the charged particle beam L, and the beam adjusting unit 15 may be omitted.

The charged particle beam L transported by the beam transport path 12 is irradiated onto the target 8 with its irradiation position controlled by the charged particle beam scanning unit 13. The charged particle beam scanning unit 13 may be omitted, and the charged particle beam L may always be irradiated to the same portion of the target 8.

The target 8 generates a neutron beam N by being irradiated with the charged particle beam L. The target 8 is made of, for example, beryllium (Be), lithium (Li), tantalum (Ta), or tungsten (W), and has a plate shape. However, the target is not limited to the plate shape, and may be liquid or the like. The neutron beam N generated by the target 8 is irradiated by the neutron beam irradiation unit 20 toward the patient S in the irradiation chamber 2.

The neutron beam irradiation unit 20 includes a moderator 21 that decelerates the neutron beam N emitted from the target 8, and a shield 22 that shields radiation such as the neutron beam N and gamma rays from being emitted to the outside. The moderator 21 and the shield 22 constitute a moderator.

The moderator 21 has, for example, a laminated structure made of a plurality of different materials, and the material of the moderator 21 is appropriately selected according to various conditions such as the energy of the charged particle beam L. Specifically, for example, when the output from the accelerator 11 is a proton beam of 30 MeV and a beryllium target is used as the target 8, the moderator 21 can be made of lead, iron, aluminum, or calcium fluoride.

The shield 22 is provided so as to surround the moderator 21, and has a function of shielding neutron rays N and radiation such as gamma rays generated accompanying the generation of the neutron rays N from being emitted to the outside of the shield 22. Have. At least a part of the shield 22 may be embedded in the wall W1 that separates the charged particle beam generation chamber 14 and the irradiation chamber 2, or may not be embedded. Further, between the irradiation chamber 2 and the shield 22, a wall member 23 forming a part of the side wall surface of the irradiation chamber 2 is provided. The wall body 23 is provided with a collimator mounting portion 23a that serves as an output port for the neutron beam N. A collimator 31 for defining the irradiation field of the neutron beam N is fixed to the collimator mounting portion 23a. The collimator 31 may be attached to the neutron capture therapy bed 3 described later without providing the collimator attachment portion 23a on the wall 23.

In the neutron beam irradiation unit 20 described above, the target 8 is irradiated with the charged particle beam L, and the target 8 generates the neutron beam N accordingly. The neutron beam N generated by the target 8 is decelerated while passing through the moderator 21, and the neutron beam N emitted from the moderator 21 passes through the collimator 31 and is placed on the bed 3 for neutron capture therapy. The patient S placed is irradiated. Here, as the neutron beam N, a thermal neutron beam or an epithermal neutron beam having relatively low energy can be used.

In order to explain the structure, XYZ coordinates are set for the neutron capture therapy system 1 as shown in FIG. The Y-axis direction indicates the irradiation direction of the neutron beam N (direction from the target 8 toward the collimator mounting portion 23a). Further, in the Y-axis direction, the downstream side in the irradiation direction of the neutron beam N is “negative” and the upstream side is “positive”. The X-axis direction indicates a direction vertical to the Y-axis in a plane horizontal to the ground. One side of the X-axis direction is “negative” and the other side is “positive”. The Z-axis direction indicates the direction perpendicular to the ground. In the Z-axis direction, the upper side is “positive” and the lower side is “negative”.

Next, the detailed configuration of the neutron capture therapy bed 3 according to the present embodiment will be described with reference to FIGS. 3 to 5. FIG. 3 is a view of the bed for neutron capture therapy viewed from the positive side in the Y-axis direction. FIG. 4 is a cross-sectional view taken along the line IV-IV shown in FIG. FIG. 5 is a view of the bed for neutron capture therapy viewed from the negative side in the Y-axis direction. 3 and 4, a patient S placed on the bed 3 for neutron capture therapy is shown. In FIG. 5, the patient S is omitted in order to explain the configuration of the bed 3 for neutron capture therapy. Further, in FIG. 5, the frame is omitted in order to explain the structure.

As shown in FIGS. 3 to 5, the bed 3 for neutron capture therapy includes a base 41, a mounting portion 42, a pair of frames 43A and 43B, a bracket 44, an arm 46, and a holding portion 47. ..

The base 41 is a member arranged on the floor surface F of the irradiation chamber 2, and is for supporting each component of the bed 3 for neutron capture therapy from below. The base 41 has a flat rectangular parallelepiped shape, and each component is provided on the upper surface 41a. On the lower surface of the base 41, traveling means such as wheels (not shown) may be provided. The base 41 can be moved on the floor surface F by the traveling means.

The placement unit 42 is a member that is provided on the base 41 and on which the patient S is placed. The placing section 42 includes a chair 51 on which the patient S sits, a support section 52 for supporting the chair 51, and a guide section 53 for moving the chair 51 and the support section 52 in the Y-axis direction. ..

The guide portion 53 is arranged at the center position in the X-axis direction on the upper surface 41a of the base 41. The guide part 53 extends along the Y-axis direction at the position. The guide portion 53 extends to the vicinity of the end of the base 41 on the positive side in the Y-axis direction. The negative end of the guide portion 53 in the Y-axis direction extends to the vicinity of the negative end of the base 41 in the Y-axis direction. The support portion 52 is arranged on the upper surface of the guide portion 53. The length of the support portion 52 in the Y-axis direction is shorter than that of the guide portion 53. The widths of the support portion 52 and the guide portion 53 in the X-axis direction are set to such a width that the patient S sitting on the chair 51 can straddle them. The support part 52 can be reciprocated in the Y-axis direction by being guided by the guide part 53.

A chair 51 is provided on the upper surface side of the support portion 52. The chair 51 is rotatable around the Z axis. For example, when the body of the patient S faces the positive side in the Y-axis direction as shown in FIG. 4, when the body of the patient S faces the positive side in the X-axis direction, the chair 51 Can be rotated 90° to the positive side in the X-axis direction (see FIG. 8). Alternatively, when the body of the patient S faces the negative side in the Y-axis direction, the chair 51 can be rotated 180° to the negative side in the Y-axis direction (see FIG. 9).

The pair of frames 43A and 43B are provided on the base 41 and extend in the Z-axis direction, that is, the vertical direction. Specifically, the frames 43A and 43B are provided at the end portion on the positive side in the Y direction of the upper surface 41a of the base 41. Further, the frame 43A is arranged on the negative side end of the upper surface 41a of the base 41 in the X-axis direction. The frame 43B is arranged at the positive side end in the X-axis direction of the upper surface 41a of the base 41. The frames 43A and 43B have side surfaces 43Aa and 43Ba facing each other in the X-axis direction.

A vertical wall 56 is provided between the pair of frames 43A and 43B. The vertical wall 56 is arranged so as to be in contact with or close to the wall 23 of the irradiation chamber 2. A through hole 57 is formed in the vertical wall 56. The through hole 57 is formed in the wall body 23 at a position corresponding to the opening of the collimator 31. That is, the central axis of the collimator 31 and the central axis of the through hole 57 are formed to coincide with each other.

An upper frame 62 that extends in the X-axis direction and connects the upper end portions to each other is provided between the upper end portion of the frame 43A and the upper end portion of the frame 43B. An upper frame 61 extending in the Y-axis direction is provided at the upper ends of the frames 43A and 43B. Further, a rear frame 63 extending downward is formed from the end of the upper frame 61 on the negative side in the Y-axis direction. A handrail, for example, may be appropriately provided on the rear frame 63.

The bracket 44 is provided on the side surfaces 43Aa and 43Ba of the frames 43A and 43B. The bracket 44 is slidable along the side surfaces 43Aa and 43Ba in the Z-axis direction, that is, up and down. Further, the bracket 44 is provided with a mechanism for detachably connecting the arm 46. The arm 46 also has a bracket for detachably connecting the holding portion 47.

Specifically, as the bracket 44, brackets 71A and 71B, brackets 72A and 72B, brackets 73A and 73B, and brackets 74A and 74B are provided in order from the top with respect to the frames 43A and 43B. .. The side walls 43Aa and 43Ba of the frames 43A and 43B can have two brackets 44 arranged side by side in the Y-axis direction. Specifically, the brackets 71A, 71B and the brackets 72A, 72A are provided on the negative side in the Y-axis direction among the side surfaces 43Aa, 43Ba, and the brackets 73A, 73B and the brackets 74A, 74B are among the side surfaces 43Aa, 43Ba. Is provided on the positive side in the Y-axis direction (see FIG. 6). As a result, the brackets 71A, 71B, 72A, 72B and the brackets 73A, 73B, 74A, 74B do not interfere with each other when moved in the vertical direction, so that the positional relationship in the vertical direction can be changed. That is, in FIGS. 4 and 5, the brackets 71A, 71B, 72A, 72B are arranged above the brackets 73A, 73B, 74A, 74B, but may be moved so as to be arranged below. ..

The holding portion 47 is a member that is attached to the frames 43A and 43B via the arm 46 and holds at least one of the occipital region of the patient S, the chin, the back, and the waist. In the present embodiment, as the pressing portion 47, a pressing portion 81 that presses the back of the head, a pressing portion 82 that presses the jaw, a pressing portion 83 that presses the elbow, and a pressing portion 84 that presses the back or waist are provided. Each pressing portion 81, 83, 84 is made of a resin material or the like extending in the X-axis direction. The holding portion 82 for holding the jaw is made of a resin material or the like on which the jaw portion is placed. Each pressing portion 81, 82, 83, 84 contacts the patient S at the contact surface. The “pressing” in the present embodiment means that the body part can be supported, and it is not necessary to positively press it. For example, the pressing portion 82 for pressing the jaw may support the jaw, and may not positively apply pressure to the jaw.

The arm 46 is a member that movably supports the pressing portion 47. One end of the arm 46 is attached to the bracket 44, and the holding portion 47 is attached to the other end of the arm 46. Further, the mounting angle of the one end of the arm 46 to the bracket 44 can be adjusted. The other end of the arm 46 can adjust the attachment angle of the pressing portion 47. Thereby, the arm can move the pressing portion 47 by adjusting each attachment angle, and adjust the position and the direction of the pressing portion 47 with respect to the patient S. Further, the arm 46 itself may be provided with a telescopic mechanism, a bending mechanism and the like. Further, as the arm 46, a deformable member such as a flexible arm or a band may be applied.

In the present embodiment, as the arm 46, the arms 91A and 91B that support the pressing portion 81 that presses the back of the head, the arm 92 that supports the pressing portion 82 that presses the jaw, and the arms 93A and 93B that support the pressing portion 83 that presses the elbow. And arms 94A and 94B that support a holding portion 84 that holds down the back or waist. One ends of the arms 91A and 91B are attached to the brackets 71A and 71B. An end portion of a holding portion 81 that holds the occipital region is attached to the other ends of the arms 91A and 91B. One end of the arm 92 is attached to one of the brackets 72A and 72B. A holding portion 82 for holding the jaw is attached to the other end of the arm 92. One ends of the arms 93A and 93B are attached to the brackets 73A and 73B. The other end of each of the arms 93A and 93B is attached with an end of a holding portion 83 that holds the elbow. One ends of the arms 94A and 94B are attached to the brackets 74A and 74B. The other end of each of the arms 94A and 94B is attached with an end of a holding portion 84 that holds the back or waist. The shape, length, and bending mode of each arm differ depending on the shape and size of the holding portion to be attached, but are not limited to those shown in the drawings.

Next, the position and the like of the pressing portion 47 according to the posture of the patient S will be described.

For example, as shown in FIGS. 3 and 4, a case will be described in which the patient S is sitting on the chair 51 and his body and head are directed toward the positive and negative sides in the Y-axis direction. In this state, the face of the patient S is arranged in front of the through hole 57 of the vertical wall 56, that is, in front of the opening portion of the collimator 31 which is the exit of the neutron beam N. Therefore, the patient's body is also maintained in a leaning position in the vicinity of the vertical wall 56. At this time, in the mounting portion 42, the position and height of the chair 51 in the Y-axis direction are adjusted according to the physique of the patient S.

The pressing part 82 for pressing the chin is arranged near the lower edge of the through hole 57, and positions the head of the patient S by pressing the chin (see also FIG. 6). At this time, the vertical position of the bracket 72B and the length and angle of the arm 92 are adjusted so that the holding portion 82 for holding the jaw is arranged at a desired position. The pressing portion 81 for pressing the occipital region is located at a position corresponding to the through hole 57 and is separated from the through hole 57 on the negative side in the Y-axis direction according to the size of the head of the patient S. Thereby, the holding part 81 holds down the occipital region of the patient S and prevents the head of the patient S from moving in each direction. At this time, the vertical positions of the brackets 71A and 71B and the length and angle of the arm 91 are adjusted so that the holding portion 81 that holds the back of the head is located at a desired position.

Here, with reference to FIG. 6, the pressing portion 81 for pressing the occipital region will be described in more detail. As shown in FIG. 6, the holding portion 81 holds the rail member 81a supported by the arms 91A and 91B and extending in the X-axis direction, the bracket 81b movable in the X-axis direction along the rail member 81a, and the back head. The pad 81c and the arm 81d that is connected to the bracket 81b and adjusts the position of the pad 81c are provided. In addition, a pair of the bracket 81b, the pad 81c, and the arm 81d is provided. Thereby, the occipital region of the patient S can be pressed so as to be sandwiched from both the positive side and the negative side in the X-axis direction. The configuration of the pressing portion 81 is not limited to that shown in FIG. 6, and for example, a rail member that extends further in the Y-axis direction may be provided on the rail member 81a, and the pad 81c may be moved along the rail member.

Returning to FIG. 3 and FIG. 4, the pressing portion 83 for pressing the elbow is arranged at a position separated from the through hole 57 by a predetermined distance and downward. Further, the contact surface of the pressing portion 83 faces upward. As a result, the holding portion 83 holds down the elbow of the patient S and enables the patient S to store his weight. In addition, the patient S can hold the weight when leaning forward by holding the elbow with the holding portion 83 in the holding portion. At this time, the vertical positions of the brackets 73A and 73B and the lengths and angles of the arms 93A and 93B are adjusted so that the pressing portion 83 that presses the elbow is arranged at a desired position.

The holding portion 84 that holds the back or the waist (here, the waist is pressed) is arranged at a position separated upward from the chair 51 according to the physique of the patient S. Further, the angle of the contact surface is adjusted according to the bending state of the waist of the patient S leaning forward. As a result, the pressing portion 84 presses the waist of the patient S and prevents the body of the patient S from moving in each direction. At this time, the vertical positions of the brackets 74A and 74B and the lengths and angles of the arms 94A and 94B are adjusted so that the pressing portion 84 that presses the waist is located at a desired position. After the patient S sits on the chair 51, the brackets 74A and 74B and the holding portion 84 are connected by the arms 94A and 94B. At this time, a band or the like may be used instead of the arms 94A and 94B.

For example, as shown in FIG. 8, a case where the patient S is sitting on the chair 51 and the body and face are directed to the positive side in the X-axis direction will be described. In this state, the temporal region of the patient S is arranged in front of the through hole 57 of the vertical wall 56, that is, in front of the opening of the collimator 31 which is the exit of the neutron beam N. Therefore, the body of the patient is also kept in the state of being oriented in the X-axis direction, with the whole body tilted toward the vertical wall 56. At this time, in the mounting part 42, the direction of the chair 51 is directed to the positive side in the X-axis direction, and the position and height in the Y-axis direction are adjusted. In this state, the positions of the pressing portion 82 that presses the chin, the pressing portion 81 that presses the occipital region, and the pressing portion 83 that presses the elbow are adjusted according to the posture of the patient S. The pressing portion 84 for pressing down the waist is removed. When any one of the holding portions is removed, the arm may be removed from the bracket, the arm may be left on the bracket, or the arm and the bracket may be removed from the frame.

Further, as shown in FIG. 7, the face of the patient S faces the positive side in the X-axis direction. Therefore, the pair of pads 81c press the vicinity of the temporal region of the patient S. Also, the position of the jaw pressing portion 82 is finely adjusted. The face of the patient S may be fixed by being covered with the bag-shaped member 95. Specifically, the bag-shaped member 95 covers the entire head and the through hole 57, and the edge of the bag-shaped member 95 is fixed to the vertical wall 56 near the through hole 57. In this case, the jaw of the patient S may be pressed by the pressing portion 82 from the outside of the bag-shaped member 95.

The orientation of the face may be the positive side in the X-axis direction as shown in FIG. 7, and the orientation of the body may be the positive side in the Y-axis direction as shown in FIG. In this case, the holding structure of FIG. 7 may be applied to the head of the patient S, and the holding structure of FIG. 4 may be applied to the body.

For example, as shown in FIG. 9, a case will be described in which the patient S is sitting on the chair 51 and his body and face are directed to the negative side in the Y-axis direction. In this state, the occipital region of the patient S is arranged in front of the through hole 57 of the vertical wall 56, that is, in front of the opening portion of the collimator 31 which is the emission port of the neutron beam N. Therefore, the upper body of the patient S is in a posture of leaning on the back side as a whole while sitting on the chair 51. At this time, in the mounting portion 42, the direction of the chair 51 is directed to the negative side in the Y-axis direction, and the position and height in the Y-axis direction are adjusted. In addition, a support base 96 for mounting the legs of the patient S may be used. The support base 96 is movably supported by an arm 97 provided on the side surface of the guide portion 53. In this state, the positions of the holding portion 81 that holds the back of the head and the holding portion 84 that holds the back are adjusted according to the posture of the patient S. The pressing part 81 for pressing the chin and the pressing part 83 for pressing the elbow are removed.

Next, the operation and effect of the bed 3 for neutron capture therapy will be described.

The neutron capture therapy bed 3 according to the present embodiment includes, in addition to the placement section 42 on which the patient S is placed, frames 43A and 43B, and a holding section 47 attached to the frames 43A and 43B. The holding part 47 attached to the frames 43A and 43B can hold at least one of the back head, the chin, the back, and the waist of the patient S. Therefore, the holding unit 47 can hold at least one of the occipital region, the chin, the back, and the waist according to the posture of the patient S placed on the placing unit 42. As described above, the patient S can easily maintain the posture by not only placing the patient S on the placement unit 42 but also pressing a portion of the body part that can reduce the burden of maintaining the posture. ..

The bed 3 for neutron capture therapy further includes an arm 46 that movably supports the pressing portion 47. Accordingly, the position of the pressing portion 47 can be finely adjusted by the arm 46 according to the posture of the patient S.

In the bed 3 for neutron capture therapy, a pair of frames 43A and 43B are provided, a vertical wall 56 is provided between the pair of frames 43A and 43B, and a through hole 57 is formed in the vertical wall 56. By arranging the vertical wall 56 provided between the frames 43A and 43B along the wall 23 of the irradiation chamber 2, the patient S can be brought close to the collimator 31 which is the emission port of the neutron beam N. At this time, by aligning the positions of the through hole 57 formed in the vertical wall 56 and the collimator 31 which is the emission port, the vicinity of the affected part of the patient S can be brought close to the collimator 31 which is the emission port through the through hole 57. it can.

Although the embodiment of the present invention has been described above, the neutron capture therapy bed according to the present embodiment is not limited to the above, and various modifications can be made.

For example, the bed for neutron capture therapy according to the above-described embodiment has a plurality of pressing parts. However, the bed for neutron capture therapy may have only one holding portion capable of holding at least one of the occipital region of the patient, the chin, the back, and the waist.

In addition, the configurations of the pressing portions and the arms in the above-described embodiment are merely examples, and the configurations may be appropriately changed as long as the patient's occipital region, chin, back, and hip can be pressed to maintain the posture. Further, although the pressing portion is movable with respect to the frame, it may not be movable.

DESCRIPTION OF SYMBOLS 1... Neutron capture therapy system, 3... Neutron capture therapy bed, 41... Base, 42... Mounting part, 43A, 43B... Frame, 46... Arm, 47... Retaining part, 56... Vertical wall, 57... Through hole, S... patient, N... neutron beam.

Claims (3)

A bed for neutron capture therapy on which a patient irradiated with neutrons is placed,
A mounting portion provided on the base and on which the patient is mounted,
A frame provided on the base,
A bed for neutron capture therapy, comprising: a holding portion attached to the frame and holding at least one of the occipital region of the patient, the chin, the back, and the waist. The bed for neutron capture therapy according to claim 1, further comprising an arm that movably supports the pressing portion. A pair of the frames is provided,
A vertical wall is provided between the pair of frames,
The bed for neutron capture therapy according to claim 1 or 2, wherein a through hole is formed in the vertical wall.

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